Unlock Dark Chao Garden: To unlock the Dark Chao Garden, raise a Dark Chao with one of the three Evil' characters. Continue to feed and train your Dark Chao until it evolves and goes into its evil cocoon.. Once it emerges, a set of descending stairs should appear at the main Chao lobby leading to the Dark Chao Garden.
Unlock Green Hill Stage:
To unlock a 3D version of the classic Green Hill stage (from Sonic the Hedgehog on Genesis), earn all 180 emblems. The new stage will appear on the world map.
Unlock Super Sonic and Hyper Shadow:
Everybody wants to play as Super Sonic, and now you can. All you need to do is complete "Last Stage?" in story mode, and you'll unlock both Super Sonic and Hyper Shadow.
Unlock Hero Garden:
To unlock the Chao Hero Garden, you must raise a Hero Chao with one of the three Hero characters. Continually feed and train your Hero Chao and it should evolve (creates a tear-shaped "cocoon"). Once it evolves, ascending stairs should appear at the main Chao lobby leading to the Hero Garden.
Unlock Last Stage:
In order to play the actual last stage of this game, finish both Hero and Dark side story games. Once done, go into story mode and a "Last Stage?" menu selection should appear between Hero and Dark selections.
